Power reception device

Abstract

To provide a technology for substituting the power source of a control circuit of a power conversion circuit when an anomaly occurs in the power source of the control circuit.SOLUTION: A power reception device 100 that receives first AC power AC1, includes: a power reception circuit 110; a power conversion circuit 120 that converts second AC power AC2, which is a part of the first AC power, into first DC power DC1; a load device 130 that consumes the first DC power; a main power source circuit 140 that supplies the second DC power DC2; an auxiliary power source circuit 160 that converts third AC power AC3, which is another part of the first AC power, to supply third DC power DC3; and a control circuit that receives power supply from the main power source circuit or the auxiliary power source circuit. The auxiliary power source circuit is supplied with the third AC power via a first portion of the power reception circuit, the first portion having a small variation in current and voltage due to a short circuit of an input unit of the power conversion circuit, and the control circuit is supplied with power from the auxiliary power source circuit in a case where the control circuit cannot receive power supplied from the main power source circuit.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a power receiving device.

Background Art

[0002] In a power receiving device used in a non-contact power supply system for a vehicle, there is a technique of supplying power to a control unit of a power conversion circuit by a plurality of power supplies as in Patent Document 1. In Patent Document 1, a DCDC converter as a power conversion circuit is provided between a rectifier circuit on the power receiving side and a battery on the load side. The power of the control unit of the DCDC converter is the output part of the rectifier circuit at the start of power reception, and is supplied from a power supply connected to the input part of the DCDC converter. In the steady state after the start of power reception, the power of the control unit of the DCDC converter is supplied from a power supply connected to the output part of the DCDC converter.

[0003] The output power of the output part of the rectifier circuit varies depending on the magnitude of the received power. However, the DCDC converter outputs stable power after startup. Therefore, the control unit of the DCDC converter can operate stably even when the received power changes after the start of power reception.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The inventor was considering a power conversion circuit that performs rectification in a power receiving device of a non-contact power supply system for a vehicle. The power conversion circuit considered by the inventor includes a switch for adjusting the output power. The power of the control unit of the switch is supplied from an auxiliary battery other than the battery as a load device of the non-contact power supply system. The inventor was considering the application of the technology of Patent Document 1 as a power supply means for replacing the auxiliary battery when the voltage drops due to an abnormality in the auxiliary battery.

[0006] However, in the power conversion circuit considered by the inventor, the output power fluctuates. That is, as in Patent Document 1, it is not possible to receive a stable power supply from the output power of the power conversion circuit. Therefore, even when the output power of the power conversion circuit fluctuates, a technology for replacing the power supply of the control unit has been demanded when an abnormality occurs in the power supply of the control unit of the power conversion circuit.

Means for Solving the Problems

[0007] This disclosure can be realized in the following forms.

[0008] According to a first aspect of the present disclosure, there is provided a power receiving device (100, 100a to 100f) that non - contactlessly receives first alternating current power (AC1) by a magnetic field. The power receiving device includes a power receiving circuit (110, 110a, 110b) including a power receiving coil (111RL) that receives the first alternating current power, a power conversion circuit (120, 120f) that converts second alternating current power (AC2), which is a part of the first alternating current power, into first direct current power (DC1), a load device (130) that consumes the first direct current power, a main power supply circuit (140) that supplies second direct current power (DC2), a sub - power supply circuit (160, 160d, 160f, 160e, 160e1, 160e2) that converts third alternating current power (AC3), which is another part of the first alternating current power, and supplies third direct current power (DC3), and a control circuit (150, 150c, 150f) that controls the power receiving device, the control circuit being powered by the main power supply circuit or the sub - power supply circuit. An output part (110o) of the power receiving circuit and an input part (120i) of the power conversion circuit are connected. The sub - power supply circuit receives the supply of the third alternating current power through the first location in the power receiving circuit, where the current and voltage fluctuations are small due to a short - circuit of the input part of the power conversion circuit, among a first location and a second location where the fluctuations are large. The control circuit executes control that combines a short - circuit mode in which the input part of the power conversion circuit is short - circuited and a power - supply mode in which the input part of the power conversion circuit is not short - circuited by the power conversion circuit, and receives power supply from the sub - power supply circuit when power supply from the main power supply circuit cannot be received.

[0009] In such a configuration, the sub - power supply circuit supplies the third direct current power to the control circuit by receiving the supply of the third alternating current power through the first location. Thereby, the control circuit can continue control even when power supply from the main power supply circuit cannot be received. Further, since the current and voltage fluctuations are small at the first location even when the short - circuit mode is executed, the third alternating current power can be supplied. The first location is caused by a configuration related to power reception or a filter configuration. Therefore, in the power receiving device of the present disclosure, the control circuit can be operated even when power supply from the main power supply circuit cannot be received.

Brief Description of the Drawings

[0010]

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Best Mode for Carrying Out the Invention

[0011] A. First Embodiment: A-1. Configuration of the Device: The non-contact power supply system 10 shown in FIG. 1 supplies power to the load device 130 non-contact by a magnetic field. The non-contact power supply system 10 includes a power transmission device 200 and a power reception device 100. That is, the non-contact power supply system 10 supplies power to the power reception device 100 non-contact from the power transmission device 200. The non-contact power supply system 10 supplies power to the load device 130 mounted on the vehicle V non-contact, for example.

[0012] The power transmission device 200 supplies AC power to the power reception device 100 non-contact by a magnetic field. The power transmission device 200 includes an AC power supply device 210 and a power transmission resonance circuit 220.

[0013] The AC power supply device 210 supplies AC power of a predetermined operating frequency to the power transmission resonance circuit 220. The AC power supply device 210 includes a power supply circuit and a power transmission circuit. The power supply circuit is, for example, an AC / DC converter circuit, and converts the AC power supplied from the utility power supply into DC power. The power transmission circuit is an inverter that converts the DC power supplied from the power supply circuit into AC power of the operating frequency. The operating frequency is, for example, 85 kHz, and is set using a predetermined power transmission frequency defined by the Radio Law or the like. Note that the operating frequency is also a frequency corresponding to the resonance frequency of the power transmission resonance circuit 220 described later.

[0014] The power transmission resonance circuit 220 transmits power to the power reception circuit 110. The power transmission resonance circuit 220 includes a power transmission coil 222 and a power transmission resonance capacitor 221 connected in series to the power transmission coil 222. That is, the power transmission resonance circuit 220 is a series resonance circuit.

[0015] The power transmission resonant capacitor 221 resonates the power transmission resonant circuit 220 with the AC power at the operating frequency of the AC power supply device 210 in a state where the power transmission coil 222 and the power reception coil 111RL are magnetically coupled. That is, the capacitance of the power transmission resonant capacitor 221 is set such that the operating frequency of the AC power supply device 210 and the resonant frequency of the power transmission resonant circuit 220 substantially coincide in a state where the power transmission coil 222 and the power reception coil 111RL are magnetically coupled.

[0016] The power transmission coil 222 generates a magnetic field corresponding to the operating frequency of the AC power supply device 210. Further, the power transmission coil 222 transmits AC power to the power reception coil 111RL by magnetically coupling with the power reception coil 111RL. That is, the power transmission coil 222 performs non-contact power transmission by utilizing the electromagnetic induction phenomenon.

[0017] The power reception device 100 receives AC power from the power transmission device 200 in a non-contact manner by a magnetic field. The power reception device 100 includes a power reception circuit 110, a power conversion circuit 120, a load device 130, a main power supply circuit 140, a sub-power supply circuit 160, a control circuit 150, a smoothing capacitor 170, and a first power transformer 180.

[0018] The power reception circuit 110 includes a power reception resonant circuit 110R and a filter circuit 110F.

[0019] The power reception resonant circuit 110R includes a power reception coil 111RL and a power reception resonant capacitor 111RC connected in series to the power reception coil 111RL. The power reception resonant circuit 110R has a resonant frequency corresponding to the frequency of the first AC power AC1. That is, the power reception resonant circuit 110R is a series resonant circuit. In this specification, the "power reception resonant circuit" is also simply referred to as the "resonant circuit".

[0020] The power receiving coil 111RL receives the first AC power AC1. The first AC power AC1 is the AC power received by the power receiving coil 111RL. In FIG. 1, the direction in which the first AC power AC1 is supplied is indicated by the arrow AC1. The power receiving coil 111RL magnetically couples with the power transmitting coil 222 by receiving the magnetic field emitted by the power transmitting coil 222. Thereby, the power receiving coil 111RL receives the first AC power AC1. The power receiving coil 111RL is used in a state of facing the power transmitting coil 222, and thereby receives the magnetic field emitted by the power transmitting coil 222. Thereby, the power receiving coil 111RL receives the first AC power AC1 in a non-contact manner.

[0021] The power receiving resonance capacitor 111RC resonates the power receiving resonance circuit 110R with the first AC power AC1 in a state where the power receiving coil 111RL and the power transmitting coil 222 are magnetically coupled. That is, the capacitance of the power receiving resonance capacitor 111RC is set such that the frequency of the first AC power AC1 and the resonance frequency of the power receiving resonance circuit 110R substantially coincide in a state where the power transmitting coil 222 and the power receiving coil 111RL are magnetically coupled.

[0022] In the present embodiment, the power receiving resonance capacitor 111RC includes a positive-side resonance capacitor 111RCp arranged on the positive-side line Lacp of the power receiving circuit 110 and a negative-side resonance capacitor 111RCn arranged on the negative-side line Lacn of the power receiving circuit 110. By arranging the power receiving resonance capacitor 111RC on both the positive-side line Lacp and the negative-side line Lacn, common-mode noise can be suppressed. In this specification, the "power receiving resonance capacitor" is also simply referred to as the "resonance capacitor".

[0023] When the power transmitting resonance circuit 220 is a series resonance circuit and the power receiving resonance circuit 110R is a series resonance circuit, the output section 110Ro of the power receiving resonance circuit 110R has a constant current characteristic. A filter circuit 110F is connected to the output section 110Ro of the power receiving resonance circuit 110R. That is, a constant current is input to the filter circuit 110F.

[0024] The filter circuit 110F suppresses the harmonic components of the first AC power AC1. The filter circuit 110F is connected between the output part 110Ro of the power receiving resonance circuit 110R and the input part 120i of the power conversion circuit 120. More specifically, the filter circuit 110F has a configuration in which two first coils 111FL and two first capacitors 111FC are connected in series to the power receiving coil 111RL and the input part 120i of the power conversion circuit 120. In FIG. 1, the two first coils 11FL are composed of the positive first coil 111FLp of the positive line Lacp and the negative first coil 111FLn of the negative line Lacn. The two first capacitors 111FC are composed of the positive first capacitor 111FCp of the positive line Lacp and the negative first capacitor 111FCn of the negative line Lacn. Further, the filter circuit 110F includes a configuration in which a second capacitor 112FC and a second coil 112FL are connected in parallel to the power receiving resonance circuit 110R.

[0025] With such a configuration, the filter circuit 110F functions as a band-pass filter. When the input part of the band-pass filter has a constant current characteristic, the output part also has a constant current characteristic. Accordingly, the location connected in series to the input part 120i of the power conversion circuit 120, which is also the output part 110Ro of the filter circuit 110F, has a constant current characteristic. The location "connected in series to the input part 120i of the power conversion circuit 120" is referred to as the "first location". In the first embodiment, the first location is the positive first coil 111FLp, the negative first coil 111FLn, the positive first capacitor 111FCp, the negative first capacitor 111FCn, the positive resonance capacitor 111RCp, the negative resonance capacitor 111RCn, and the power receiving coil 111RL. In FIG. 1, the first location is shown thicker than other locations.

[0026] In this specification, the constant current characteristic means the property that the fluctuations of current and voltage are small when the output part of the circuit is short-circuited. Specifically, the property that the fluctuations of current and voltage are small means that the current and voltage do not reach 0V when the output part of the circuit is short-circuited. In this specification, the part where the fluctuations of current and voltage are small is the first part. That is, the first part has the property that the current and voltage do not reach 0V even when the input part 120i of the power conversion circuit 120 is short-circuited.

[0027] In this specification, the part where the fluctuations of current and voltage are large with respect to the first part is referred to as the "second part". The second part is the part where the power transmission coil 222 and the input part 120i of the power conversion circuit 120 are connected in parallel. In the first embodiment, the second part is the second capacitor 112FC and the second coil 112FL.

[0028] In the filter circuit 110F, the negative-side first coil 111FLn supplies the third AC power AC3 to the secondary power supply circuit 160. The third AC power AC3 is a part of the power of the first AC power AC1. In FIG. 1, the direction in which the third AC power AC3 is supplied is indicated by the arrow AC3. The negative-side first coil 111FLn is also the primary side of the first power transformer 180 described later. The first power transformer 180 is composed of the primary-side negative-side first coil 111FLn and the secondary-side first secondary power supply coil 161. When the first AC power AC1 is supplied to the power receiving circuit 110, an electromotive force is generated in the negative-side first coil 111FLn. As a result, a part of the first AC power AC1, the third AC power AC3, is output from the first secondary power supply coil 161 through the negative-side first coil 111FLn. The third AC power AC3 is supplied to the secondary power supply circuit 160 to which the first secondary power supply coil 161 is connected.

[0029] The power conversion circuit 120 converts the second AC power AC2 into the first DC power DC1. The second AC power AC2 is a part of the power of the first AC power AC1. More specifically, the second AC power AC2 is the power obtained by removing the third AC power AC3 from the first AC power AC1. That is, the second AC power AC2 is a part of the power of the first AC power AC1, and the third AC power AC3 is another part of the power of the first AC power AC1. In FIG. 1, the direction in which the second AC power AC2 is supplied is indicated by the arrow AC2.

[0030] The power conversion circuit 120 is a full-bridge circuit that uses four MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) as switching elements. The power conversion circuit 120 includes two leg circuits, a first leg circuit 121 and a second leg circuit 122. The switch Sw is driven by receiving a voltage corresponding to a command from the control circuit 150 at its gate. The "power conversion circuit" in the first embodiment is also referred to as a "synchronous rectification circuit".

[0031] In a leg circuit, two switches Sw are connected in series. Further, the leg circuit connects the positive electrode line Ldcp and the negative electrode line Ldcn of the DC power. One of the terminals of the output part 110Ro of the power receiving circuit 110 is connected between the two switches Sw of the leg circuit. The connection between the two switches Sw of the leg circuit is the input part 120i in the power conversion circuit 120. That is, the output part 110Ro of the power receiving circuit 110 and the input part 120i of the power conversion circuit 120 are connected.

[0032] As described above, the power conversion circuit 120 converts the second AC power AC2, which is a part of the first AC power AC1, into the first DC power DC1. The conversion by the power conversion circuit 120 will be described in detail later.

[0033] The smoothing capacitor 170 is connected in parallel between the output of the power conversion circuit 120 and the load device 130. The smoothing capacitor 170 smooths the DC current and DC voltage supplied to the load device 130.

[0034] The load device 130 consumes the first DC power DC1 supplied via the power conversion circuit 120. For example, the load device 130 is a battery and a battery protection circuit, etc. In this case, the first DC power DC1 is charged to the battery and then used for the vehicle's running.

[0035] The main power supply circuit 140 supplies the second DC power DC2 to the control circuit 150. The second DC power DC2 is the power supplied via a power source different from the first AC power AC1. For example, the second DC power DC2 is the power with the accessory battery in the vehicle V as the power source. The main power supply circuit 140 includes, for example, an accessory battery and a DC / DC converter. That is, when the DC / DC converter is connected to the control circuit 150, the main power supply circuit 140 supplies the second DC power DC2 necessary for the operation of the control circuit 150 to the control circuit 150 via the DC / DC converter.

[0036] The auxiliary power supply circuit 160 supplies the third DC power DC3 to the control circuit 150 by converting the third AC power AC3, which is a part of the first AC power AC1, into the third DC power DC3. As shown in FIG. 2, the auxiliary power supply circuit 160 includes a first auxiliary power supply coil 161, a rectifier circuit 162, and a protection circuit that protects the control circuit 150 from overvoltage, noise, etc. The auxiliary power supply circuit 160 receives the third AC power AC3 from the first auxiliary power supply coil 161. The auxiliary power supply circuit 160 converts it into the third DC power DC3 via the rectifier circuit 162 and the protection circuit. Therefore, the auxiliary power supply circuit 160 supplies the third DC power DC3 to the control circuit 150. Note that the voltage of the third AC power AC3 is transformed by the first power transformer 180 based on the rated voltage of the auxiliary power supply circuit 160.

[0037] Note that the first auxiliary power supply coil 161 is included in the auxiliary power supply circuit 160, but in the drawings other than FIG. 2, for ease of understanding of the technology, the first auxiliary power supply coil 161 is shown separated from the auxiliary power supply circuit 160.

[0038] The auxiliary power supply circuit 160 supplies power to the control circuit 150 when the main power supply circuit 140 cannot supply power to the control circuit 150. The switching between the main power supply circuit 140 and the auxiliary power supply circuit 160 will be described in detail later.

[0039] As shown in FIG. 1, the first power transformer 180 has a primary side composed of a negative-side first coil 111FLn and a secondary side composed of a first auxiliary power supply coil 161. That is, the first power transformer 180 supplies a third AC power AC3, which is a part of the first AC power AC1, to the auxiliary power supply circuit 160 via the negative-side first coil 111FLn and the first auxiliary power supply coil 161. The first power transformer 180 is a multi-winding transformer, and the primary side and the secondary side are electrically insulated from each other. The turns ratio of the first power transformer 180 is designed based on the rated voltage of the auxiliary power supply circuit 160. Therefore, the voltage of the third AC power AC3 is transformed based on the rated voltage of the auxiliary power supply circuit 160.

[0040] The control circuit 150 controls the power receiving device 100. The control circuit 150 receives power supply from the main power supply circuit 140 or the auxiliary power supply circuit 160. The control circuit 150 includes a control unit 151, a drive circuit 152, and a switching circuit (not shown). The switching circuit will be described in detail later.

[0041] The drive circuit 152 drives the switch Sw of the power conversion circuit 120. More specifically, the drive circuit 152 outputs the power required for driving the switch Sw in response to a command from the control unit 151. The drive circuit 152 is connected to the respective gates of all the switches Sw of the power conversion circuit 120. That is, the drive circuit 152 drives the switch Sw by applying a gate voltage required for the on and off operations of the switch Sw to the gate of the switch Sw. In FIG. 1, for ease of understanding of the technology, the connection between the drive circuit 152 and the gate is omitted.

[0042] The control unit 151 causes the power conversion circuit 120 to execute a power supply mode or a short - circuit mode. More specifically, the control unit 151 generates a signal for controlling the on - and - off operations of the switch Sw. The control unit 151 is mainly composed of, for example, a microcomputer and includes a CPU, a ROM, a RAM, etc. (not shown).

[0043] A - 2. Power supply mode and short - circuit mode: The control unit 151 causes the power conversion circuit 120 to execute control that combines a short - circuit mode in which the input section 120i of the power conversion circuit 120 is short - circuited and a power supply mode in which the input section 120i of the power conversion circuit 120 is not short - circuited. The operations of the power receiving device 100 in each of the power supply mode and the short - circuit mode will be described below.

[0044] In FIG. 3, in the positive half - cycle of the second AC power AC2, the direction of the current flowing through the power receiving device 100 in the power supply mode is indicated by the arrow Aia. For ease of understanding of the technology, in FIGS. 3 to 6 used for the description of the control modes, the illustration of the power transmission device 200, the control circuit 150, etc. is omitted. In the power supply mode, among the two leg circuits, current flows through the switch Sw of the positive - electrode line Ldcp in one leg circuit and the switch Sw of the negative - electrode line Ldcn in the other leg circuit. Thereby, the current in the power supply mode in the positive half - cycle of the second AC power AC2 is rectified by the power conversion circuit 120 and flows to the load device 130. That is, the first DC power DC1 is supplied to the load device 130.

[0045] In FIG. 4, in the positive half cycle of the second AC power AC2, the direction of the current flowing through the power receiving device 100 in the short - circuit mode is indicated by the arrow Aib. In the short - circuit mode, current flows through the switches Sw of the negative - pole lines Ldcn in the two leg circuits. That is, the control unit 151 controls the switches Sw of the negative - pole lines Ldcn in the two leg circuits to be in the on state, thereby short - circuiting the input part 120i of the power conversion circuit 120. As a result, in the short - circuit mode in the positive half cycle of the second AC power AC2, the current does not flow through the load device 130 via the power conversion circuit 120. That is, the first DC power DC1 is not supplied to the load device 130.

[0046] In FIG. 5, in the negative half cycle of the second AC power AC2, the direction of the current flowing through the power receiving device 100 in the power - feeding mode is indicated by the arrow Aic. The current in the power - feeding mode in the negative half cycle of the second AC power AC2 is rectified by the power conversion circuit 120 and flows through the load device 130, similar to the power - feeding mode in the positive half cycle. That is, the first DC power DC1 is supplied to the load device 130.

[0047] In FIG. 6, in the negative half cycle of the second AC power AC2, the direction of the current flowing through the power receiving device 100 in the short - circuit mode is indicated by the arrow Aid. The current in the short - circuit mode in the negative half cycle of the second AC power AC2 does not flow through the load device 130 via the power conversion circuit 120, similar to the short - circuit mode in the positive half cycle. That is, the first DC power DC1 is not supplied to the load device 130.

[0048] The control unit 151 executes control that combines a short - circuit mode and a power - feeding mode in order to control, for example, the first DC power DC1 by means of the power conversion circuit 120. The control unit 151 executes the short - circuit mode and the power - feeding mode during half of one cycle of the second AC power AC2. That is, the first DC power DC1 is controlled by the ratio of the period of the short - circuit mode and the period of the power - feeding mode in the half - cycle. For example, the control unit 151 sets the ratio of the period of the short - circuit mode and the period of the power - feeding mode in the half - cycle to a predetermined ratio so that the first DC power DC1 does not exceed the rated power of the load device 130. Thus, the first DC power DC1 is controlled.

[0049] A - 3. Switching of the power supply circuit: When the main power supply circuit 140 is in a normal state, the control circuit 150 is powered by the main power supply circuit 140. However, when power supply from the main power supply circuit 140 cannot be received due to an abnormality in the main power supply circuit 140, the control circuit 150 is powered by the auxiliary power supply circuit 160. An abnormality in the main power supply circuit 140 is, for example, a case where the auxiliary battery as the power source of the main power supply circuit 140 fails to output power due to a fault.

[0050] The control circuit 150 includes a switching circuit (not shown) as described above. The switching circuit switches between the main power supply circuit 140 and the auxiliary power supply circuit 160. The switching circuit is, for example, a diode - OR circuit. In the switching circuit, the output parts of the main power supply circuit 140 and the auxiliary power supply circuit 160 are connected to the control circuit 150 via rectifier diodes. When the switching circuit receives the supply of the second DC power DC2, it causes the control circuit 150 to be supplied with the second DC power DC2. When the switching circuit does not receive the supply of the second DC power DC2, it causes the control circuit 150 to be supplied with the third DC power DC3.

[0051] Even when the control circuit 150 is powered by the secondary power supply circuit 160, it executes control combining the short - circuit mode and the power - supply mode. In the short - circuit mode, the input section 120i of the power conversion circuit 120 is short - circuited. However, the secondary power supply circuit 160 receives the supply of the third AC power AC3 via the first location in the power receiving circuit 110. Therefore, the control circuit 150 can be powered by the secondary power supply circuit 160 even when it is executing the short - circuit mode.

[0052] In such a form, the secondary power supply circuit 160 supplies the third DC power DC3 to the control circuit 150 by receiving the supply of the third AC power AC3 via the first location. Thereby, the control circuit 150 can continue control even when it cannot be powered by the main power supply circuit 140. Further, since the first location has small current and voltage fluctuations even when the short - circuit mode is executed, it can supply the third AC power AC3. Therefore, the power receiving device 100 of the present disclosure can operate the control circuit 150 even when the control circuit 150 cannot be powered by the main power supply circuit 140.

[0053] Furthermore, by adopting such a form, the secondary power supply circuit 160 is supplied with power via the first coil 111FL that constitutes the filter circuit 110F. Different from the filter circuit 110F, the resonance circuit 110R resonates based on the frequency of the received AC power. For this reason, the voltage of the elements of the resonance circuit 110R tends to be higher than the voltage of the elements of the filter circuit 110F. Therefore, the power receiving device 100 of the present disclosure can reduce the loss generated in the secondary power supply circuit 160 by reducing the voltage applied to the secondary power supply circuit 160 by supplying power from the filter circuit 110F to the secondary power supply circuit 160.

[0054] Furthermore, by adopting such a configuration, the secondary power supply circuit 160 receives the supply of the third AC power AC3 via the first power transformer 180. As a result, the voltage applied to the secondary power supply circuit 160 is easily reduced according to the turns ratio of the first power transformer 180. Therefore, the power receiving device 100 of the present disclosure can reduce the loss of the secondary power supply circuit 160 as compared with the configuration in which the secondary power supply circuit 160 is directly connected to the first location. Further, since the secondary power supply circuit 160 is insulated from the power receiving circuit 110 by the first power transformer 180, it is less susceptible to noise from the power receiving circuit 110.

[0055] B. Second Embodiment: In the above embodiment, the control unit 151 executes control combining the short - circuit mode and the power - supply mode in order to control the first DC power DC1. However, the control unit 151 may further execute control combining the short - circuit mode and the power - supply mode in order to protect the load device 130. More specifically, the control unit 151 of the second embodiment executes the short - circuit mode when receiving power supply from the secondary power supply circuit 160. That is, the control unit 151 of the second embodiment executes the short - circuit mode when it is unable to receive power supply from the main power supply circuit 140 due to an abnormality in the main power supply circuit 140. When the short - circuit mode is executed, the supply of the first DC power DC1 to the load device 130 is stopped. Thereby, the power receiving device 100 of the second embodiment can prevent the abnormality of the main power supply circuit 140 from affecting the load device 130. Note that the configuration of the second embodiment is the same as that of the first embodiment.

[0056] Using FIG. 7, the specific processing by the control unit 151 will be described. The control unit 151 starts processing when it is unable to receive power supply from the main power supply circuit 140.

[0057] In step S100 of FIG. 7, the control circuit 150 receives power supply from the secondary power supply circuit 160. That is, the control circuit 150 operates with the third DC power DC3 by switching the power supply circuit.

[0058] In step S110 of FIG. 7, the control unit 151 determines the control mode. If the short - circuit mode is being executed, the control unit 151 proceeds with the process to step S120. If the power - supply mode is being executed, the control unit 151 proceeds with the process to step S130.

[0059] In step S120 of FIG. 7, the control circuit 150 continues the short - circuit mode. That is, the control circuit 150 switches from the control combining the short - circuit mode and the power - supply mode to the control executing only the short - circuit mode. After the process of step S120, the control circuit 150 ends the process.

[0060] In step S130 of FIG. 7, the control circuit 150 executes the short - circuit mode. That is, the control circuit 150 switches from the power - supply mode to the short - circuit mode. For example, even if the control circuit 150 periodically executes the power - supply mode, it executes the short - circuit mode regardless of the period of the power - supply mode. After the process of step S130, the control circuit 150 ends the process.

[0061] In such a form, when the main power - supply circuit 140 cannot supply power to the control circuit 150, the control circuit 150 receives power from the sub - power - supply circuit 160 and executes the short - circuit mode. Thereby, the power - receiving device 100 of the present disclosure can prevent the abnormality of the main power - supply circuit 140 from affecting the load device 130.

[0062] C. Third Embodiment: In the above embodiment, the filter circuit 110F includes a plurality of capacitors and a plurality of coils. However, as shown in FIG. 8, the filter circuit 110F may be constituted by one first coil 111FL. That is, the first portion includes a negative-side first coil 111FLn, a negative-side resonance capacitor 111RCn, a positive-side resonance capacitor 111RCp, and a power transmission coil 222. Note that the filter circuit 110Fa of the third embodiment functions as a low-pass filter. When the input section 110Ro of the low-pass filter has a constant current characteristic, the output section 110o of the low-pass filter also has a constant current characteristic. Other configurations of the third embodiment are the same as those of the first embodiment. In FIG. 8, the reference numerals of the first embodiment are appended with "a" to indicate configurations different from those of the first embodiment.

[0063] With such a configuration, compared with the configuration in which the filter circuit 110F is constituted by a plurality of first coils 111FL or the configuration in which the filter circuit 110F includes the first capacitor 111FC, the configuration of the power receiving circuit 110a of the present disclosure is simplified. More specifically, compared with a configuration including a band-pass filter or an impedance filter, the power receiving circuit 110a of the present disclosure can reduce the number of components and shorten the wiring length. Therefore, the power receiving device 100a of the present disclosure can prevent malfunction due to the influence of noise through, for example, a filter or wiring.

[0064] D. Fourth Embodiment: As shown in FIG. 9, in the non-contact power supply system 10b of the fourth embodiment, the power transmission device 200b includes a power transmission resonance circuit 220b of a parallel resonance circuit. More specifically, the power transmission resonance circuit 220b includes a power transmission coil 222 and a power transmission resonance capacitor 221b connected in parallel to the power transmission coil 222. That is, in the non-contact power supply system 10b of the fourth embodiment, the power transmission resonance circuit 220b is a parallel resonance circuit and the power receiving resonance circuit 110R is a series resonance circuit. As a result, the output section 110Ro of the power receiving resonance circuit 110R has a constant voltage characteristic.

[0065] In the non-contact power supply system 10b of the fourth embodiment, the power receiving circuit 110b includes a filter circuit 110Fb that functions as an impedance filter. In the filter circuit 110Fb, four first coils 111FLb are connected in series to the power receiving coil 111RL and the input section 120i of the power conversion circuit 120. The four first coils 111FLb are composed of two positive-side first coils 111FLp and two negative-side first coils FLn. Further, a second capacitor 112FCb that connects between the two positive-side first coils 111FLp and between the two negative-side first coils FLn is connected to the filter circuit 110Fb.

[0066] With such a configuration, the filter circuit 110Fb functions as an impedance filter. When the input section 110Ro of the impedance filter has a constant voltage characteristic, the output section 110o of the impedance filter has a constant current characteristic. In the fourth embodiment, since the power transmission resonance circuit 220b is a parallel resonance circuit and the power receiving resonance circuit 110R is configured as a series resonance circuit, the output section 110Ro of the power receiving resonance circuit 110R has a constant voltage characteristic. Therefore, since the filter circuit 110Fb is connected to the output section 110Ro of the power receiving resonance circuit 110R, the output section 110R of the filter circuit 110Fb has a constant current characteristic. That is, the location connected in series to the input section 120i of the power conversion circuit 120, which is also the output section of the filter circuit 110Fb, has a constant current characteristic. For this reason, in the fourth embodiment, the first location is composed of two positive-side first coils 111FLp, two negative-side first coils 111FLn, a positive-side resonance capacitor 111RCp, a negative-side resonance capacitor 111RCn, and the power receiving coil 111RL. Note that other configurations of the fourth embodiment are the same as those of the first embodiment. In FIG. 11, configurations different from those of the first embodiment are denoted by adding "b" to the reference numerals of the first embodiment.

[0067] With such a configuration, the filter circuit 110Fb has a constant current characteristic. Therefore, even when the resonance circuit 110R has a constant voltage characteristic, the power receiving device 100b of the present disclosure can have a first location where voltage and current fluctuations are small.

[0068] E. Fifth Embodiment: In addition to the configuration of the power receiving device 100 of the first embodiment, the power receiving device 100c of the fifth embodiment further includes a first voltage sensor 190 that acquires the voltage of the secondary power supply circuit 160.

[0069] The first voltage sensor 190 is connected in parallel to the first secondary power supply coil 161. Specifically, the first voltage sensor 190 is an integrating circuit. The first voltage sensor 190 acquires the current value flowing through the first secondary power supply coil 161 by integrating the voltage value applied to the first secondary power supply coil 161. The current value flowing through the first secondary power supply coil 161 is based on the turns ratio of the first power transformer 180 and the current value flowing through the negative-side first coil 111FLn. Therefore, the first voltage sensor 190 is the current flowing through the negative-side first coil 111FLn, and transmits information related to the input current of the power conversion circuit 120 to the control unit 151.

[0070] The control unit 151c of the fifth embodiment controls the ratio of the short-circuit mode period to the power supply mode period in the cycle of the first AC power AC1 according to the value obtained by integrating the voltage by the first voltage sensor 190. That is, the control unit 151c controls the first DC power DC1. For example, when an excessive current flows through the negative-side first coil 111FLn due to an abnormality of the power receiving device 100, the control unit 151c increases the ratio of the short-circuit mode in the cycle of the first AC power AC1. Therefore, the load device 130 can be protected by reducing or stopping the supply of the first DC power DC1. In addition, the control unit 151c can control the ratio of the short-circuit mode period to the power supply mode period so as to satisfy the first DC power DC1 required by the load device 130 based on the current flowing through the negative-side first coil 111FLn. Other configurations of the fifth embodiment are the same as those of the first embodiment. In FIG. 10, components different from those of the first embodiment are denoted by adding "c" to the reference numerals of the first embodiment.

[0071] That is, in such a form, the integrated value of the voltage becomes information based on the current flowing through the first coil 111FL. The control circuit 150c can control, for example, the power adjustment of the load device 130 and the protection operation against overcurrent without the need for a current sensor that detects the input current of the power conversion circuit 120. Generally, since a voltage sensor is less expensive than a current sensor, the power receiving device 100c of the present disclosure can reduce the cost of the device.

[0072] F. Sixth Embodiment: In the first embodiment, the first power transformer 180 supplies the third AC power AC3 to the secondary power supply circuit 160 via the first coil 111FL of the filter circuit 110F. However, the first power transformer 180 of the sixth embodiment is configured such that the primary side is constituted by the power transmission coil 222 and the secondary side is constituted by the second secondary power supply coil 161d, as shown in FIG. 11. The first power transformer 180 of the sixth embodiment corresponding to the first power transformer 180 of the first embodiment is referred to as the second power transformer 180d. The second secondary power supply coil 161d corresponds to the first secondary power supply coil 161 of the first embodiment.

[0073] That is, the second power transformer 180d supplies the third AC power AC3, which is a part of the first AC power AC1, to the secondary power supply circuit 160d via the power receiving coil 111RL and the second secondary power supply coil 161d. The second power transformer 180d is a multi-winding transformer, and the primary side and the secondary side are electrically insulated from each other. The turns ratio of the second power transformer 180d is designed based on the rated voltage of the secondary power supply circuit 160d. Other configurations of the sixth embodiment are the same as those of the first embodiment. In FIG. 11, for configurations different from those of the first embodiment, the reference numerals of the first embodiment are appended with d. However, for ease of understanding of the technology, the illustration of the filter circuit 110F is omitted.

[0074] With such a form, even when an abnormality occurs in the first coil 111FL or the first capacitor 111FC, the secondary power supply circuit 160d can normally supply the third DC power DC3 to the control unit 151 via the elements of the resonance circuit 110R.

[0075] Furthermore, by adopting such a configuration, the voltage applied to the secondary power supply circuit 160 can be easily reduced according to the turns ratio of the second power transformer 180d. Therefore, the power receiving device 100d of the present disclosure can reduce the loss of the secondary power supply circuit 160d as compared with the configuration in which the secondary power supply circuit 160d is directly connected to the power receiving coil 111RL. Furthermore, since the secondary power supply circuit 160d is insulated from the power receiving circuit 110 by the second power transformer 180d, it is less susceptible to noise from the power receiving circuit 110.

[0076] G. Seventh Embodiment: In the first embodiment, the third AC power AC3 is supplied to the secondary power supply circuit 160 via the first power transformer 180. However, the third AC power AC3 may be supplied to the secondary power supply circuit 160 by other means. The power receiving device 100 of the seventh embodiment does not include the first power transformer 180. In FIG. 12, the part corresponding to the first coil 111FL of the first embodiment is shown. As shown in FIG. 12, the input part 160ei of the secondary power supply circuit 160e of the seventh embodiment is connected to both ends of the negative-side first coil 111FLn. The secondary power supply circuit 160e includes an insulating capacitor 161e connected in series to both ends of the input part 160ei, and a rectifying circuit 162e including a Zener diode.

[0077] The secondary power supply circuit 160e is supplied with the third AC power AC3 via the insulating capacitor 161e. That is, the secondary power supply circuit 160e is electrically insulated from the power receiving circuit 110. The secondary power supply circuit 160e rectifies the third AC power AC3 by the rectifying circuit 162e. The secondary power supply circuit 160e supplies the third DC power DC3 to the control circuit 150 with a constant voltage by a Zener diode set based on the rated voltage of the control circuit 150. Other configurations of the seventh embodiment are the same as those of the first embodiment. In FIG. 11, components different from the secondary power supply circuit 160 of the first embodiment are denoted by adding "e" to the reference numerals of the first embodiment.

[0078] By adopting such a configuration, the secondary power supply circuit 160e can be miniaturized as compared with a configuration in which power is supplied through a transformer while being insulated from the power receiving circuit 110. Further, since the secondary power supply circuit 160e is insulated from the power receiving circuit 110, it is less susceptible to noise from the power receiving circuit 110. Moreover, since the secondary power supply circuit 160e does not include a resistor, its loss is reduced, enabling it to operate with high efficiency.

[0079] H. Eighth Embodiment: In the above embodiment, in the short - circuit mode, the switches Sw of the negative - pole lines Ldcn in the two leg circuits are controlled to be in the on state, thereby short - circuiting the input section 120i of the power conversion circuit 120. However, the short - circuit mode may be realized by other methods. The power conversion circuit 120f of the eighth embodiment includes a protection circuit 123 that short - circuits the input section 120i, as shown in FIG. 13. The power conversion circuit 120 executes the power - supply mode and the short - circuit mode by means of the protection circuit 123.

[0080] More specifically, the protection circuit 123 is a switch that connects the negative - side line Lacn and the positive - side line Lacp at the input section 120i of the power conversion circuit 120. The protection circuit 123 switches between on and off in response to a command from the control circuit 150f. That is, the protection circuit 123 turns on when the short - circuit mode is executed by the control circuit 150f. The protection circuit 123 turns off when the power - supply mode is executed by the control circuit 150f. Thus, in the short - circuit mode, the input section 120i of the power conversion circuit 120f is short - circuited by the protection circuit 123.

[0081] Furthermore, the control circuit 150f of the seventh embodiment includes an inversion output section 153. Specifically, the inversion output section 153 is a NOT gate. The inversion output section 153 inverts the command from the control section 151f and sends it to the drive circuit 152f.

[0082] Note that the control unit 151f issues a command to cause the protection circuit 123f to execute the power supply mode and the short - circuit mode by a pulse signal. The protection circuit 121f operates in the short - circuit mode when the pulse signal is on. The protection circuit 121f operates in the power supply mode when the pulse signal is off. Therefore, when the pulse signal from the control unit 151f is on, it is inverted by the inversion output unit 153 to cause the protection circuit 121f to execute the power supply mode. When the pulse signal from the control unit 151f is off, it is inverted by the inversion output unit 153 to cause the protection circuit 121f to execute the short - circuit mode.

[0083] For example, when the control circuit 150f cannot receive power supply, the pulse signal of the control unit 151f is turned off. That is, the protection circuit 123 executes the short - circuit mode. Therefore, when the supply of the first DC power DC1 is stopped, the load device 130 is protected in the event of an abnormality in such a power receiving device 100f.

[0084] Other configurations of the sixth embodiment are the same as those of the first embodiment. In FIG. 13, for configurations different from those of the first embodiment, the reference numerals of the first embodiment are appended with f. Note that the leg circuit in the power conversion circuit 120f performs rectification under the control of another control circuit 150 (not shown).

[0085] With such a configuration, the secondary power supply circuit 160f supplies only the power necessary for the control of the protection circuit 123. Therefore, the power receiving device 100f of the present disclosure can reduce the rated power of the secondary power supply circuit 160f compared to a form in which circuits other than the protection circuit 123 of the power conversion circuit 120f are also controlled. That is, the power receiving device 100f of the present disclosure can miniaturize the secondary power supply circuit 160f.

[0086] Furthermore, since the control circuit 150f controls only the switch of the protection circuit 123, the control of the power receiving device 100f of the present disclosure is more easily realized than controlling other switches Sw of the power conversion circuit 120f.

[0087] Furthermore, in such a configuration, when the power receiving device 100 of the present disclosure cannot receive power supply by the control circuit 150f, an off pulse signal is output. By the inversion output unit 153, an on pulse signal is input to the protection circuit 123, and the short - circuit mode is implemented. Therefore, when an abnormality occurs in the control circuit 150f, the power receiving device 100f of the present disclosure can protect the load device 130 by operating the protection circuit 123 in the short - circuit mode.

[0088] I. Ninth Embodiment: In the above embodiment, the power receiving device 100 is mounted on the vehicle V as an example. When the power receiving device 100 is mounted on the vehicle V and the vehicle V is provided with a vehicle control unit 20 that controls the vehicle V, the control circuit 150 may notify the vehicle control unit 20. As shown in FIG. 14, the power transmission device 200 transmits power to the power receiving device 100 mounted on the vehicle V while being laid on the ground G. The power receiving device 100 of the eighth embodiment includes a second voltage sensor that detects the voltage of the first sub - power supply coil 161 instead of the first voltage sensor 190 of the fifth embodiment. The second voltage sensor sends the instantaneous value of the voltage, rather than an integration circuit, to the control unit 151 of the ninth embodiment. Other configurations of the ninth embodiment are the same as those of the fifth embodiment.

[0089] When the voltage of the sub - power supply circuit 160 is lower than a predetermined reference voltage by the second voltage sensor, the control circuit 150 of the ninth embodiment executes the short - circuit mode or notifies the vehicle control unit 20 of information based on the input voltage of the sub - power supply circuit 160. When the input voltage of the sub - power supply circuit 160 is equal to or higher than the predetermined reference voltage, the control circuit 150 of the ninth embodiment executes the power - supply mode. The reference voltage is, for example, the maximum voltage of the sub - power supply circuit 160 in a normal state.

[0090] With such a configuration, when the input voltage of the sub - power supply circuit 160 is lower than the reference voltage as an abnormal state, for example, the power receiving device 100 can be protected by executing the short - circuit mode, or the vehicle V can be notified of the abnormality to prompt the driver of the vehicle V to consider countermeasures.

[0091] J. Modification Example 1: In the eighth embodiment, the protection circuit 123 is constituted by a switch Sw that connects the negative-side line Lacn and the positive-side line Lacp. However, the protection circuit 123 may be constituted by the switch Sw on the negative electrode line Ldcn side in the two leg circuits in the power conversion circuit 120. That is, the control circuit 150f controls only the switch Sw on the negative electrode line Ldcn side in the two leg circuits. Since the short-circuit mode is realized only by the switch Sw on the negative electrode line Ldcn side, control of the switch Sw on the positive electrode line Ldcp side is not required. However, the switch Sw on the positive electrode line Ldcp side is controlled by another control circuit.

[0092] With such a configuration, the secondary power supply circuit 160 supplies only the power necessary for a part of the switches Sw of the power conversion circuit 120. Therefore, the power receiving device 100f of the present disclosure can reduce the rated power of the secondary power supply circuit 160 as compared with the configuration that controls all the switches Sw of the power conversion circuit 120f. That is, the power receiving device 100f of the present disclosure can miniaturize the secondary power supply circuit 160.

[0093] Furthermore, since the protection circuit 123 is constituted by the switch Sw of the power conversion circuit 120f, the power conversion circuit 120f does not need to add a switch Sw for the protection circuit 123. Therefore, the power receiving device 100f of the present disclosure is miniaturized.

[0094] K. Modification Example 2: The filter circuit 110Fb of the fourth embodiment may function as an impedance filter with other configurations. For example, the impedance filter can also be realized by the configuration of the filter circuit 110Fb1 in FIG. 15. In FIG. 15, the filter circuit 110Fb in FIG. 9 is replaced by the filter circuit 110Fb1. Note that in FIG. 15, for ease of understanding of the technology, the illustration of the power transmission device 200b, the control circuit 150, etc. is omitted. The filter circuit 110Fb1 in FIG. 15 has a positive-side first coil 111FLp and a negative-side first coil 111FLn connected in series to the power reception coil 111RL and the input section 120i of the power conversion circuit 120. Further, the filter circuit 110Fb1 in FIG. 15 has a second capacitor 112FCb connected to the output section 110Ro of the power reception resonance circuit 110R. Such a configuration of the filter circuit 110Fb1 can also realize the impedance filter.

[0095] L. Modification Example 3: The filter circuit 110F in the first embodiment may function as a band-pass filter with other configurations. For example, the band-pass filter can also be realized by the filter circuits 110F1 to 110F3 in FIGS. 16 to 18. In FIGS. 16 to 18, the filter circuit 110F in FIG. 1 is replaced by the filter circuits 110F1 to 110F3. Note that in FIGS. 16 to 18, for ease of understanding of the technology, the illustration of the power transmission device 200, the control circuit 150, etc. is omitted.

[0096] The filter circuit 110F1 in FIG. 16 has a negative-side first coil 111FLn and a positive-side first capacitor 111FCp connected in series to the power reception coil 111RL and the input section 120i of the power conversion circuit 120.

[0097] The filter circuit 110F2 in FIG. 17, in addition to the filter circuit 110F1 in FIG. 16, further has a second capacitor 112FC connected to the output section 110Ro of the power reception resonance circuit 110R.

[0098] The filter circuit 110F3 in FIG. 18 has a positive-side first coil 111FLp, a positive-side first capacitor 111FCp, a negative-side first coil 111FLnn, and a negative-side first capacitor 111FCn connected in series between the power receiving coil 111RL and the input section 120i of the power conversion circuit 120.

[0099] Even with the above configuration, the band-pass filter is realized.

[0100] M. Modification Example 4: The secondary power supply circuit 160e of the seventh embodiment may be realized by other configurations. For example, the rectifier circuit 162e1 in the secondary power supply circuit 160e1 of FIG. 19 has a configuration in which one rectifier diode connected in series to the insulation capacitor 161e is removed from the rectifier circuit 162e in FIG. 12 of the seventh embodiment. In addition, the rectifier circuit 162e2 in the secondary power supply circuit 160e2 of FIG. 20 is configured by a bridge circuit of rectifier diodes. Even with the above configuration, the secondary power supply circuit 160e of the seventh embodiment is realized.

[0101] N. Modification Example 5: (1) In the above embodiment, the power receiving device 100 is mounted on the vehicle V. However, the power receiving device 100 may be mounted on other moving bodies. For example, the power receiving device 100 may be mounted on an airplane. (2) In the above embodiment, a battery is exemplified as the load device 130. However, the load device 130 is not limited to a battery. The load device 130 may be, for example, a lighting device or a power device. (3) In the first embodiment, the power receiving resonance capacitor 111RC includes a positive-side resonance capacitor 111RCp arranged on the positive-side line Lacp of the power receiving circuit 110 and a negative-side resonance capacitor 111RCn arranged on the negative-side line Lacn of the power receiving circuit 110. However, the power receiving resonance capacitor 111RC may include only the positive-side resonance capacitor 111RCp arranged on the positive-side line Lacp of the power receiving circuit 110. (4) In the third embodiment, the filter circuit 110F is composed of one first coil 111FL. However, the filter circuit 110F may be composed of one or more first coils 111FL. For example, the filter circuit 110F may be composed of two or three first coils 111FL. (5) In the above embodiment, the switch Sw of the synchronous rectifier circuit 120 is a MOSFET. However, the switch Sw of the synchronous rectifier circuit 120 may be other switching elements. The switch Sw may be, for example, a BJT (Bipolar junction transistor) or an IGBT (Insulated Gate Bipolar Transistor). (6) In the above embodiment, the case where power supply cannot be received from the main power supply circuit 140 includes, as an example, the failure of the auxiliary battery. However, due to other factors, the control circuit 150 may reach a state where power supply cannot be received from the main power supply circuit 140. For example, due to insufficient remaining amount of the auxiliary battery or a circuit failure of the load device 130, the control circuit 150 may reach a state where power supply cannot be received from the main power supply circuit 140. (7) In the sixth embodiment, the power receiving circuit 110 includes the filter circuit 110F. However, the power receiving circuit 110 may not include the filter circuit 110F. (8) In the seventh embodiment, the control circuit 170f includes the inverting output section 153. However, the control circuit 170f may not include the inverting output section 153. (9) In the above embodiment, the secondary power supply circuit 160 receives the supply of the third AC power AC3 via the first coil 111FL or the power receiving coil 111RL. However, the secondary power supply circuit 160 may receive the supply of the third AC power AC3 from the first capacitor 111FC or the power receiving resonance capacitor 111RC. (10) In the above embodiment, the secondary power supply circuit 160 receives the supply of the third AC power AC3 in a state electrically insulated from the power receiving circuit 110 by the first power transformer 180 and the insulating capacitor 161e. However, the secondary power supply circuit 160 may receive the supply of the third AC power AC3 in a state electrically connected to the power receiving circuit 110. (11) In the above embodiment, the secondary power supply circuit 160 may be configured by combining the first power transformer 180 and the insulating capacitor 161e. That is, the secondary power supply circuit 160 receives the supply of the third AC power AC3 via the first power transformer 180 and the insulating capacitor 161e. Therefore, the secondary power supply circuit 160 is less likely to be affected by noise from the power receiving circuit 110 due to double insulation. (12) In the above embodiment, the switching circuit is a diode OR circuit. However, the switching circuit may be configured by a switch. When the switch of the switching circuit is driven by the second DC power DC2 and receives the supply of the second DC power DC2, it connects the control circuit 150 and the main power supply circuit 140. When the switch of the switching circuit does not receive the supply of the second DC power DC2, it connects the control circuit 150 and the secondary power supply circuit 160.

[0102] The present disclosure is not limited to the above embodiments and modifications, and can be realized in various configurations without departing from the gist thereof. For example, the embodiments and modifications corresponding to the technical features in each form described in the summary of the invention can be appropriately replaced or combined in order to solve part or all of the above problems or to achieve part or all of the above effects. Also, if the technical feature is not described as essential in this specification, it can be appropriately deleted.

[0103] O. Other forms: The features of the present disclosure are shown as follows. (Form 1) A power receiving device (100, 100a to 100f) that receives the first AC power (AC1) non - contactlessly by a magnetic field, A power receiving circuit (110, 110a, 110b) including a power receiving coil (111RL) for receiving the first AC power; A power conversion circuit (v) that converts second AC power (AC2), which is a part of the first AC power, into first DC power (DC1); A load device (130) that consumes the first DC power; A main power supply circuit (140) that supplies second DC power (DC2); A sub - power supply circuit (160, 160d, 160f, 160e, 160e1, 160e2) that converts third AC power (AC3), which is another part of the first AC power, and supplies third DC power (DC3); A control circuit (150, 150c, 150f) that controls the power receiving device (100), the control circuit being powered by the main power supply circuit or the sub - power supply circuit, An output part (110o) of the power receiving circuit and an input part (120i) of the power conversion circuit are connected; The sub - power supply circuit receives the supply of the third AC power through the first location in the power receiving circuit, where the first location has small fluctuations in current and voltage due to a short - circuit of the input part of the power conversion circuit, among the first location and the second location where the fluctuations are large; The control circuit Executes control that combines a short - circuit mode in which the input part of the power conversion circuit is short - circuited by the power conversion circuit and a power - supply mode in which the input part of the power conversion circuit is not short - circuited; A power receiving device that can be powered by the sub - power supply circuit when it cannot be powered by the main power supply circuit. (Embodiment 2) The power receiving device according to Embodiment 1, wherein the control circuit executes the short - circuit mode when being powered by the sub - power supply circuit. (Embodiment 3) The power receiving device according to Embodiment 2, wherein the power receiving circuit further includes a resonance circuit (110R) having a resonance frequency corresponding to the frequency of the first AC power and a filter circuit (110F, 110F1 - 110F3, 110Fb, 110Fb1) that suppresses harmonic components of the first AC power. The resonance circuit includes the power receiving coil. In the filter circuit, at least one of one or more first coils (111FL) and one or more first capacitors (111FC) is connected in series between the power receiving coil and the input part of the power conversion circuit. The power receiving device, wherein the first location is at least one of the one or more first capacitors and the one or more first coils. (Embodiment 4) A power receiving device according to Embodiment 3, wherein the secondary power supply circuit further includes a first secondary power supply coil (161). A power receiving device, wherein a first coil that supplies the third AC power to the secondary power supply circuit among the one or more first coils and the first secondary power supply coil constitute a first power supply transformer (180) that supplies the third AC power to the secondary power supply circuit. (Embodiment 5) A power receiving device according to Embodiment 4, wherein the filter circuit is one of the one or more first coils. (Embodiment 6) A power receiving device according to Embodiment 4, wherein an output part of the resonance circuit has a constant voltage characteristic. A power receiving device, wherein the filter circuit is an impedance filter when the output part of the resonance circuit has the constant voltage characteristic. (Embodiment 7) A power receiving device according to Embodiment 4, wherein the filter circuit is a band-pass filter. (Embodiment 8) A power receiving device according to Embodiment 4, and further, a first voltage sensor (190) that acquires a voltage of the first secondary power supply coil, the first voltage sensor integrating the voltage of the first secondary power supply coil. A power receiving device, wherein the control circuit further controls a ratio between a period of the short circuit mode and a period of the power supply mode in a period of the first AC power according to a value obtained by integrating the voltage by the first voltage sensor. (Embodiment 9) A power receiving device according to Embodiment 1, The power receiving circuit further includes a resonance circuit having a resonance frequency corresponding to the frequency of the first AC power. The resonance circuit includes the power receiving coil and one or more resonance capacitors (111RC). The first location is a power receiving device including the one or more resonance capacitors and the power receiving coil. (Embodiment 10) The power receiving device according to Embodiment 9, The secondary power supply circuit further includes a second secondary power supply coil (161d). The power receiving coil and the second secondary power supply coil constitute a second power transformer (180d) that supplies the third AC power to the secondary power supply circuit. A power receiving device. (Embodiment 11) The power receiving device according to any one of Embodiments 1, 2, 3, and 9, The secondary power supply circuit further includes an insulating capacitor (161e) connected in series across both ends of the input section of the secondary power supply circuit. A power receiving device. (Embodiment 12) The power receiving device according to any one of Embodiments 1 to 10, The power conversion circuit further includes a protection circuit (123) that short - circuits the input section of the power conversion circuit. In the short - circuit mode, the protection circuit short - circuits the input section of the power conversion circuit. A power receiving device. (Embodiment 13) The power receiving device according to Embodiment 12, The control circuit issues a command to cause the protection circuit to execute the power supply mode and the short - circuit mode by a pulse signal. The protection circuit performs the operation of the short - circuit mode when the pulse signal is in the on state and performs the operation of the power supply mode when the pulse signal is in the off state. The control circuit further includes an inversion output section that inverts the pulse signal. A power receiving device. (Embodiment 14) The power receiving device according to Embodiment 1, mounted on a vehicle (V), The vehicle includes a vehicle control unit (20) that controls the vehicle. The power receiving device further includes a second voltage sensor that detects the voltage of the secondary power supply circuit. The control circuit When the voltage of the secondary power supply circuit is lower than a predetermined reference voltage by the second voltage sensor, the execution of the short-circuit mode or notification of information based on the input voltage of the secondary power supply circuit to the vehicle control unit is performed. A power receiving device that executes the power feeding mode when the voltage of the secondary power supply circuit is higher than the predetermined reference voltage.

Description of Signs

[0104] 10, 10a~10f… Non-contact power feeding system, 100, 100a~100f… Power receiving device, 110, 110a, 110b… Power receiving circuit, 110Ro… Output unit, 111RL… Power receiving coil, 120, 120f… Power conversion circuit, 120i… Input unit, 130… Load device, 140… Main power supply circuit, 150, 150c, 150f… Control circuit, 160, 160d, 160f, 160e, 160e1, 160e2… Secondary power supply circuit, AC1… First AC power, AC2… Second AC power, AC3… Third AC power, DC1… First DC power, DC2… Second DC power, DC3… Third DC power

Claims

1. A power receiving device (100, 100a to 100f) that receives first AC power (AC1) non - contactlessly by a magnetic field, comprising: A power receiving circuit (110, 110a, 110b) including a power receiving coil (111RL) that receives the first AC power; A power conversion circuit (120, 120f) that converts second AC power (AC2), which is part of the first AC power, into first DC power (DC1); A load device (130) that consumes the first DC power; A main power supply circuit (140) that supplies second DC power (DC2); A sub - power supply circuit (160, 160d, 160f, 160e, 160e1, 160e2) that converts third AC power (AC3), which is another part of the first AC power, and supplies third DC power (DC3); A control circuit (150, 150c, 150f) that controls the power receiving device (100), the control circuit being powered by the main power supply circuit or the sub - power supply circuit, An output part (110o) of the power receiving circuit and an input part (120i) of the power conversion circuit are connected; The sub - power supply circuit receives the supply of the third AC power through the first location in the power receiving circuit where the fluctuations of current and voltage are small due to a short - circuit of the input part of the power conversion circuit, out of the first location and the second location where the fluctuations are large; The control circuit: Executes control combining a short - circuit mode in which the input part of the power conversion circuit is short - circuited by the power conversion circuit and a power - supply mode in which the input part of the power conversion circuit is not short - circuited; A power receiving device that receives power from the sub - power supply circuit when power supply from the main power supply circuit is not available.

2. The power receiving device according to claim 1, wherein: The control circuit executes the short - circuit mode when receiving power from the sub - power supply circuit.

3. The power receiving device according to claim 2, wherein: The power receiving circuit further includes a resonance circuit (110R) having a resonance frequency corresponding to the frequency of the first AC power and a filter circuit (110F, 110F1 to 110F3, 110Fb, 110Fb1) that suppresses harmonic components of the first AC power; The resonance circuit includes the power receiving coil; In the filter circuit, at least one of one or more first coils (111FL) and one or more first capacitors (111FC) is serially connected to the power receiving coil and the input part of the power conversion circuit. The first location is a power receiving device that is at least one of the one or more first capacitors and the one or more first coils.

4. The power receiving device according to claim 3, wherein the secondary power supply circuit further includes a first secondary power supply coil (161), a first coil that supplies the third AC power to the secondary power supply circuit among the one or more first coils and the first secondary power supply coil constitute a first power supply transformer (180) that supplies the third AC power to the secondary power supply circuit.

5. The power receiving device according to claim 4, wherein the filter circuit is one of the first coils.

6. The power receiving device according to claim 4, wherein the output part of the resonance circuit has a constant voltage characteristic, and the filter circuit is an impedance filter when the output part of the resonance circuit has the constant voltage characteristic.

7. The power receiving device according to claim 4, wherein the filter circuit is a band-pass filter.

8. The power receiving device according to claim 4, further comprising a first voltage sensor (190) that acquires the voltage of the first secondary power supply coil, and includes a first voltage sensor that integrates the voltage of the first secondary power supply coil, wherein the control circuit further controls the ratio of the period of the short-circuit mode and the period of the power supply mode in the period of the first AC power according to the value obtained by integrating the voltage by the first voltage sensor.

9. The power receiving device according to claim 1, wherein the power receiving circuit further includes a resonance circuit having a resonance frequency corresponding to the frequency of the first AC power, the resonance circuit includes the power receiving coil and one or more resonance capacitors (111RC), and the first location is the one or more resonance capacitors and the power receiving coil.

10. The power receiving device according to claim 9, wherein the secondary power supply circuit further includes a second secondary power supply coil (161d), and the power receiving coil and the second secondary power supply coil constitute a second power supply transformer (180d) that supplies the third AC power to the secondary power supply circuit.

11. The power receiving device according to any one of claims 1, 2, 3, and 9, wherein the secondary power supply circuit further includes an insulating capacitor (161e) connected in series across both ends of the input part of the secondary power supply circuit.

12. The power receiving device according to any one of claims 1 to 10, The power conversion circuit further includes a protection circuit (123) that short - circuits the input part of the power conversion circuit. The short - circuit mode is a power receiving device that short - circuits the input part of the power conversion circuit by the protection circuit.

13. The power receiving device according to claim 12, wherein the control circuit issues a command to cause the protection circuit to execute the power supply mode and the short - circuit mode by a pulse signal. The protection circuit operates in the short - circuit mode when the pulse signal is in the on state and operates in the power supply mode when the pulse signal is in the off state. The control circuit further includes an inversion output part that inverts the pulse signal, the power receiving device.

14. The power receiving device according to claim 1, mounted on a vehicle (V), wherein the vehicle includes a vehicle control unit (20) that controls the vehicle. The power receiving device further includes a second voltage sensor that detects the voltage of the secondary power supply circuit. The control circuit, when the voltage of the secondary power supply circuit is lower than a predetermined reference voltage by the second voltage sensor, executes the short - circuit mode or notifies the vehicle control unit of information based on the input voltage of the secondary power supply circuit. when the voltage of the secondary power supply circuit is higher than the predetermined reference voltage, executes the power supply mode, the power receiving device.

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